tools: ynl-gen: fix parse multi-attr enum attribute

When attribute is enum type and marked as multi-attr, the netlink respond
is not parsed, fails with stack trace:
File "/root/arek/linux-dpll/tools/net/ynl/lib/ynl.py", line 600, in dump
  return self._op(method, vals, dump=True)
File "/root/arek/linux-dpll/tools/net/ynl/lib/ynl.py", line 586, in _op
  rsp_msg = self._decode(gm.raw_attrs, op.attr_set.name)
File "/root/arek/linux-dpll/tools/net/ynl/lib/ynl.py", line 453, in _decode
  self._decode_enum(rsp, attr_spec)
File "/root/arek/linux-dpll/tools/net/ynl/lib/ynl.py", line 410, in _decode_enum
  value = enum.entries_by_val[raw - i].name
TypeError: unsupported operand type(s) for -: 'list' and 'int'
error: 1

Allow succesfull parse of multi-attr enums by decoding and assigning their
names into response in the _decode_enum(..) function.

Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>

Author: kubalewski

tools/net/ynl/lib/ynl.py

@@ -407,7 +407,14 @@ def _decode_enum(self, rsp, attr_spec):
                 raw >>= 1
                 i += 1
         else:
-            value = enum.entries_by_val[raw - i].name
+            if attr_spec.is_multi:
+                for index in range(len(raw)):
+                    if (type(raw[index]) == int):
+                        enum_name = enum.entries_by_val[raw[index] - i].name
+                        rsp[attr_spec['name']][index] = enum_name
+                return
+            else:
+                value = enum.entries_by_val[raw - i].name
         rsp[attr_spec['name']] = value
 
     def _decode_binary(self, attr, attr_spec):